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arXiv 1509.02243physics.plasm-ph
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非麦克斯韦等离子体的点火阈值

Ignition threshold for non-Maxwellian plasmas

Michael J. Hay, Nathaniel J. Fisch

摘要:

光学薄的$p$ - $^{11}$ B等离子体在韧致辐射中损失的能量比从聚变反应中获得的能量要多,除非离子温度可以升高到电子温度以上。在热等离子体中,所需的温度差在小库仑对数范围内是可能的,其特征在于高密度和低温。计算了热$p$ - $^{11}$ B等离子体的最小Lawson判据和ICF体积点火所需的最小$ρR$。如果能用非热离子分布改善聚变反应性,点火将更容易实现。为了建立一个上限,这个效用,我们考虑一个单能束粒子能量的选择,以最大限度地提高束热反应性。释放聚变α能量以保持这样的束有利于在较低密度和$ρR$下点火,提高恒定压力下的反应性,并且可以用于去除氦灰。因此,实现与光束的增益建立一个上限的点火阈值,可以实现与任何非热分布的减少,这些$p$ - $^{11}$ B和DT等离子体进行评估。

英文摘要:

An optically thin $p$-$^{11}$B plasma loses more energy to bremsstrahlung than it gains from fusion reactions, unless the ion temperature can be elevated above the electron temperature. In thermal plasmas, the temperature differences required are possible in small Coulomb logarithm regimes, characterized by high density and low temperature. The minimum Lawson criterion for thermal $p$-$^{11}$B plasmas and the minimum $ρR$ required for ICF volume ignition are calculated. Ignition could be reached more easily if the fusion reactivity can be improved with nonthermal ion distributions. To establish an upper bound for this utility, we consider a monoenergetic beam with particle energy selected to maximize the beam- thermal reactivity. Channeling fusion alpha energy to maintain such a beam facilitates ignition at lower densities and $ρR$, improves reactivity at constant pressure, and could be used to remove helium ash. The gains realized with a beam thus establish an upper bound for the reductions in ignition threshold that can be realized with any nonthermal distribution; these are evaluated for $p$-$^{11}$B and DT plasmas.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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